Abstract:
An apparatus and method for testing conformance of service choreography are provided. The apparatus for testing conformance of service choreography analyzes an architecture and an operation between web services cooperating on a distributed network to test conformance of a choreography application into which the web services are combined, on the basis of a service choreography specification.
Abstract:
An Internet Set-Top Box (ISTB) and a method of providing wideband IP telephony services using the ISTB are provided, which are capable of implementing wideband voice communication services using a wideband voice codec, controlling a Real-Time Transport Protocol (RTP) packet payload to process a variety of wideband speech frame payloads, and providing high-quality wideband IP telephony services by controlling a jitter buffer to maintain conference call synchronization.
Abstract:
A service based application integrated testing apparatus, system and method is provided. The service based application integrated testing apparatus comprises an application integrated testing unit performs an integrated test on the at least one component service and the service based application by use of a control flow and a data flow, which are generated from an interaction between the at least one component service and the service based application.
Abstract:
A method and an apparatus for encoding and decoding audio signals using adaptive sinusoidal coding are provided. The audio signal encoding method includes the steps of dividing a synthesized audio signal into a plurality of sub-bands, calculating the energy of each sub-band, selecting a predetermined number of sub-bands having a relatively large amount of energy from the sub-bands, and performing sinusoidal coding with regard to the selected sub-bands. Application of sinusoidal coding based on consideration of the amount of energy of each sub-band of the synthesized signal improves the quality of the synthesized signal more efficiently.
Abstract:
A media-gateway controller for call set-up processing when different codecs are used and a method therefor are provided. A storage unit stores a codec conversion table indicating a relationship between a first codec and a second codec in conversion from the first codec to the second codec. A receiver receives first call setting data including codec data of a caller from the caller and receives first call response data including codec data of a callee from the callee as a response to second call setting data having been transmitted to the callee. A data transformer searches the codec conversion table for a first codec using the caller's codec data as an index and adds a second codec corresponding to the searched first codec to the first call setting data to generate the second call setting data. In addition, the data transformer searches the codec conversion table for a second codec using the callee's codec data as an index and replaces the callee's codec data included in the first call response data with a first codec corresponding to the searched second codec to generate a second call response data. A transmitter transmits the second call setting data to the callee and transmits the second call response data to the caller.
Abstract:
An encoding method of an encoder is provided. The encoder generates first MDCT coefficients by transforming an input signal, and generates MDCT indices by quantizing the first MDCT coefficients. The encoder generates second MDCT coefficients by dequantizing the MDCT indices, and calculates MDCT residual coefficients using differences between the first MDCT coefficients and the second MDCT coefficients. The encoder generates a residual index by encoding the MDCT residual coefficients, and generates gain indices corresponding to gains from the first MDCT coefficients and the second MDCT coefficients.
Abstract:
A method and an apparatus for encoding and decoding audio signals using adaptive sinusoidal coding are provided. The audio signal encoding method includes the steps of dividing a synthesized audio signal into a plurality of sub-bands, calculating the energy of each sub-band, selecting a predetermined number of sub-bands having a relatively large amount of energy from the sub-bands, and performing sinusoidal coding with regard to the selected sub-bands. Application of sinusoidal coding based on consideration of the amount of energy of each sub-band of the synthesized signal improves the quality of the synthesized signal more efficiently.
Abstract:
A method for distributing components of a distributed computing system, according to an embodiment of the present invention, includes determining an appropriate number of available server instances, classifying a plurality of components loaded on the distributed computing system into clusters of which the number is equal to the number of the available server instances with reference to interdependent relations among the components, calculating an amount of computing resources required for each of the component clusters classified, rearranging the component clusters to adjust each of the amount of computing resources required for the component clusters to a value within an appropriate range, and deploying the component clusters, of which the computing resource request amounts are adjusted, to the available server instances.
Abstract:
Provided are a method and an apparatus for decoding an audio signal. A method for decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses includes decoding the encoded audio signal, setting a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal pulse coding scheme, dividing the smoothing frequency band into one or more subbands, and smoothing the decoded audio signal on a subband-by-subband basis. Accordingly, a decoding operation time can be reduced and the quality of a synthesized signal can be improved by variably setting a frequency band to be smoothed, when decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses.
Abstract:
An encoding apparatus is provided. The encoding apparatus includes a track structure determiner determining a track structure using frequency coefficients, a frequency coefficient allocator allocating the frequency coefficients to each track according to the determined track structure, and a quantizer quantizing one or more pulses in each track based on a number of frequency coefficients allocated to a corresponding track. The encoding apparatus can prevent the degradation of sound quality by avoiding the problem faced by most sinusoidal quantization techniques using a fixed track structure, i.e., a failure to quantize all pulses due to mismatches between the pulse distribution of frequency coefficients and a track structure.